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Coal Bed Methane for the Future of Gas Reserves in Indonesia

Coal bed methane for the future of gas reserves in Indonesia is one topic explained in BUMI Bulletin published by SKK Migas (Indonesia Special Task Force for Oil and Gas). This topic is very interesting because I never considered coal bed methane (CBM) as source of gas until now. CBM is hydrocarbon formed and kept in source rock, it does not move or migrate. In Indonesia, CBM reservoir is very wide and its resource and reserve is large.

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Renewable Energy Sources: Solar, Wind, and Hydropower

Renewable energy is increasing around the world. This is because energy from fossil fuel becomes scarce. In Indonesia, based on RUPTL 2018, government plant to increase geothermal energy source from 5% in 2018 to 12% in 2025. The percentage of other renewable energy is 0% in 2018 to 2% in 2025.

What is renewable energy? Renewable energy is generated from sources that naturally replenish themselves and never run out.

Renewable energy could be alternative to combat with climate change because it does not generate direct greenhouse gas emission. The only emission that renewable energy generate is indirect greenhouse gas emission, which are from installation, operation, and maintenance. Read More

LPG vs Natural Gas

In Indonesia, people use LPG or natural gas to cook foods or to produce hot water for bath. In my city, natural gas is less popular than LPG. However, in other area, people are starting to switch from LPG to natural gas. It is because the government program to utilize it as city gas.

Let’s take a closer look at which one is better from a cost, usability, and safety point of view. Read More

Small Scale Geothermal Power Plant is My Project of the Year

It’s been a while since the last post I wrote in this blog. I always, always want to have a fresh start and be consistent in this way. So, here I am, updating this blog! Yeay!

I’ve learnt many things during this year. In this very first post of the year, I want to share you what projects I have done and on-going at the moment. Hopefully you can enjoy it.

At the beginning of the year, I had a small scale geothermal power plant. It was my very first geothermal power plant project. So, I was very excited and of course… worried. Read More

LNG Regasification Vessel Requirement based on DNV Classification Notes No. 16.3

In previous posts, I shared some of onshore LNG terminal and regasification system. How about offshore LNG regasification system? Does it have any differences with onshore regasification system? In this post, I want to share you practical guidance of offshore regasification vessel from DNV (Det Norske Veritas) Classification Notes No. 16.3. DNV Classification Notes No. 16.3 is applicable for all vessels engages in LNG regasification.

Regasification vessel is intended to regasify LNG then delivered the gas to pipeline gas grid, through a Submerged Turret Buoy or through dedicated export manifold. The Classification Notes specifically explains regasification systems and offloading systems for natural gas through submerged turret buoy offshore or through dedicated gas unloading manifolds. Read More

Cargo Emergency Shut Down System in Liquefied Gas Carrier

I am interested in designing ship-to-shore link and ESD arrangement in LNG vessel. I have involved in about three LNG projects, but I did not design or paid more attention in this field (because all the projects were front-end engineering design). In this post, I want to share you practical information about ESD arrangement as suggested by SIGTTO (Society of International Gas Tanker and Terminal Operators).

Function of Emergency Shut Down System

Function of cargo ESD system is to stop cargo liquid and vapor flow in the event of emergency and to bring the cargo handling system to safe condition. Read More

Methane number empirical models

Understanding Methane Number

In my previous LNG project, we need to supply gas with specified minimum methane number and specified higher heating value.

What is methane number?

It is the measure of resistance of fuel gases to engine knock, known as detonation. Detonation is produced by the auto-ignition of fuel/air mixture ahead of the propagating flame. Detonation must be immediately stopped to avoid increase of wear and tear and engine damage.

If MN is too low, the detonation can reduce engine efficiency and increases the quantity of harmful engine emissions.

MN Calculation

I searched if there is formula for the calculation, but I cannot find it. MN is not gas thermodynamic property, so no equation of state can be used to calculate it. I found there are several online methane number calculators. I tested three of them, Cummin, Wartsilla, and DNV MN calculator, respectively by using LNG Tangguh composition. These are the results.

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Natural Gas Quality Designation Parameters

When I was working on my second EPC project in Senoro, which was gas processing facility, I read that there are several natural gas quality that shall be complied. In the project, we also had to guarantee that the facilities can process gas from wells so that it met requirement as stated in contract. In this post, I want to share you the quality designation parameters for natural gas. To understand more about this area, please check ISO 13686: Natural Gas – Quality Designation.

Natural gas quality designation parameter
Natural gas quality designation parameter

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